(1)
(1) 24bit-> 16-color gif Remap (Bayer redn.))
(2)
(2) 24bit-> 16-color gif (Floyd/St. redn.) = 7kb
(3)
(4)
(3) 24bit-> 16-color gif (Burke redn.), (4) 24bit-> 16-color gif (Stucki redn.)
(5)
(6)
(5) 24bit-> 256-color gif remap (Bayer redn.), (6) 24bit-> 256-color gif (Floyd/St. redn.)
(7)
(8)
(7) 24bit-> 256-color gif (Burke reductn.), (8) 24bit-> 256-color gif (Stucki redn.)
(9)
(9) 256-color (=8bit) -> 16-color BMP (cleaned up manually) -> 16-color GIF = 2kb.